Stop-motion mechanism for knitting-machines



(No Model.) 2 Sheets-Sheet 2.

A. T. L. DAVIS.

STOP MOTION MECHANISM FOR KNITTING MACHINES.

No. 400,063. Patented Mar. 26, 1880.

N. PETERS Phomumnwphn Walhingtun. 0.1:.

NTTED STATES PATENT OFFICE.

ALBERT T. L. DAVIS, OF LAKE VILLAGE, ASSIGNOR TO THE PITMAN MANU- FACTURING COMPANY, OF LAOONIA, NE\V HAMPSHIRE.

STOP-MOTION MECHANISM FOR KNITTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 400,063, dated March 26, 1889. Application filed February 2 3, 1888. Serial No, 264,940. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT T. L. DAVIS, a citizen of the United States, residing in Lake Village, in the county of Belknap and State of New Hampshire, have invented an Improved Stop-Motion Mechanism for Knitting-Machines; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, making part of this specification.

Figure 1 of the drawings is a side view of my improved mechanism; Fig. 2, a side View of the same, taken at right angles to the View in Fig. 1.

Like letters designate corresponding parts in both figures.

In the drawings A represents the powershaft, and B the driving-shaft, of a knittingmachine, connected with or geared to the machine in any usual or known manner. Upon the shaft A are two (preferably grooved) pulleys, a a, at a little distance apart, as inclicated in the drawings, and on the shaft B are two other corresponding pulleys, b I). From each pulley a to the opposite or corresponding pulley, b, a belt, 0, passes. The two belts C O are loose or slack on their pulleys, and require binders to make them tight for transmitting power and -motion to the drivingshaft. For tightening the belts two movable binding-pulleys, D D, are employed to be pressed against the belts. As shown in the drawings, these binding-pulleys are mounted on sliding bars E E, which terminate in suitable handles, (Z (Z. I have shown also the pulley-pivot f of each binder-bar as supported and adjusted in a slot, 6, of the bar, which slides in a part of the frame on which the device is mounted. The bars near the outer or handle end rest and slide on a transverse catch-bar, G, or its equivalent, and there is a notch, g, in the under edge of each binderbar adapted to catch upon the catch-bar when the binder is pushed against the belt, and thereby to hold the belt taut. There is also a transverse sliding bar, H, for the purpose of lifting the binder-bars sufficiently to free their notches from the bar G and allow the belt to push back the binder to stop the motion of the belt and of the whole machine. In

the upper edge of this lifting-bar are inclined surfaces or cam-faces h h, one being shown at one end of a notch and the other at the end of the bar. The arrangement of this lifting-bar in connection with the two binderbars is such that when the lifting-bar is in the position shown in Fig.2 either one of the bars is or may be depressed and catch over the catch-bar; but when the lifter-bar is moved endwise to the proper extent the binder-bars will be lifted by the adjacent cam-faces sufficiently to lift them from the catch-bar and allow the binder to be set free and the belts to be slackened to stop the machine. Since only one binder-bar is ever fastened upon the catch-bar, the lifting-bar never acts on but one binder-bar at one time, and when it has lifted a binder-bar from the catch-bar both binder-bars are free and the machine stops. Either binder may thus be brought into action and released. The two driving-belts are used alternately, one passing around a larger driving-pulley a and the other around a smaller pulley a, so as to drive the machine at a greater or less speed, as required, or by differentsized receiving pulleys b b, if preferred. It is to be understood, however, that the stop mechanism is applicable to single belts and pulleys as well as to double, as shown.

The binders are set free automatically and their times automatically regulated by a pattern-chain or its equivalent by means substantially as follows: On the driving-shaft B is a cam, I, which as the shaft revolves acts upon the arm 2' of a vibratory cam-lever, J, pivoted to the frame at it, so that the lever is vibrated at each revolution of the drivingshaft, the lever being retracted by a spring, I. On a projecting arm,m, of the lever is a cam, K, which as the arm is vibrated up and down acts upon the rear end of a pawl, L, represented as sliding in ways n n of the frame and retracted by a spring, 0. The pawl acts upon a ratchet-wheeLM, on a shaft, 29, which carries the sprocket-wheel N of a pattern-. chain, 0. The pattern-chain has its cam projections r r at the required distance apart to release the binder after the notched wheel has been turned as many notches as are equal to the number of revolutions of the drivingshaft l3 required to cause the requisite length of the knit web before stopping the machine. The eani projections "r 7' may act, as shown, directly on the releasing-bar ll to lift the binder-bars from the catch-bars. The releasing-bar is retracted by a spring, .9, or other suitable means. The arm in of the lever J terminates in a handle by which the pawl L, and consequently the ratehet-wheel M and sprocket-wheel N, may be moved by hand.

The whole device as constructed is Very simple and compact.

This stop mechanism is applicable to any machine requirin automatic stopping.

I claim as my in\'ention The condnnation,with the power-shaft pro- 

